linux c/c++ code to start/kill the process

[dragondad]

I have a question regarding how to keep track of the process which started from one process, and able to communicate to it, then kill it if necessary.
Currently, the easiest way is use the system() call to start the process, but no PID can be track, impossible to kill it.
Any good idea of how to handle the process.

[techieMoe]

why not use fork()? That will return a PID you can use to monitor the child process.

http://www.cs.bsu.edu/homepages/fwo/cgi-bin/man.pl?fork

[Santa's little helper]

I have a question regarding how to keep track of the process which started from one process, and able to communicate to it, then kill it if necessary.

What kind of communication do you want to do ?

By the way apart from fork check out also execve

[dragondad]

Actually, I need to do some kind of process management from the main process, when main process parse the config file, it will determine how to start each sub process (to handle different task), each process should able to be started and killed individually, and need the communication channel (such as pipe or message queue) between the main process and the subprocess.
Any suggestion of the framework or process management package can be used. Thanks.

[Santa's little helper]

For pipes check out man 3 mkfifo
For killing them man 2 kill

[hr.asadi]

Have a look into linux threads. I think it's not wise to start different processes for a single program, and ofcourse you can share normal datas such as C variables.

[cengkarim]

You can use getpid(), it will return current process id.
Use getppid(), it will return parent process id.
For process and threads communications you can use shared memory. It is much easier, much faster. Search for it, if you didn't find anything useful ask again and i'll post useful things for you.